Dear Steve,
the metal cover protects the valve and the tube of the adjustable tyre
pressure control system. The driver can inflate and deflate each tyre
from the dashboard in the cab.
Have a look at the page:
http://home.t-online.de/home/kettenkrad/andreas.htm
to see the TATRA 813, which I drove on the Kummersdorf proving ground
near Berlin some month ago. You can see the valve protect covers clearly.
Best regards
Andreas
Kettenkrad homepage: http://home.t-online.de/home/kettenkrad
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